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Date September 23,2003 Quarter 3`d Quarter,2003 BP QUARTERLY GROUNDWATER MONITORING REPORT Facility No 11191 Address 1469 West Hammer Lane, Stockton, CA ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person URS/Vernon Elarth Consultant Project No 38466254 OL058 Primary Agency/Regulatory ID No Harlin Knoll San Joaquin County Environmental Health Department Assembly Bill 681 Status Property owned by Conoco Phillips WORK PERFORMED THIS QUARTER (Third 2003): I Groundwater samples were collected from site monitoring wells MW-I through MW-7 and were submitted for laboratory analyses 2 URS compiled and evaluated groundwater monitoring data WORK PROPOSED FOR NEXT QUARTER (Fourth 2003): 1 Groundwater samples will be collected from site monitoring wells and submitted for laboratory analyses 2 URS will compile and evaluate groundwater monitoring data QUARTERLY RESULTS SUMMARY (Third 2003): r Current Phase of Project Monitoring Frequency of Groundwater Sampling MW-1 through MW-7 _ Frequency of Groundwater Monitoring Quarterly Is Free Product (FP) Present on Site No FP Recovered This Quarter NA Cumulative FP Recovered to Date NA Approximate Depth to Groundwater 49 60 to 51 62 feet below ground surface Direction of Groundwater Flow South-Southeast Groundwater Gradient 0 007 ft/ft ANALYTICAL DATA REVIEW: Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, LCS/LCSD results,MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory with the following limitations • The reported results for TPHg in samples MW-1, MW-2, MW-3, and MW-5 are due to a discrete peak at C5 (probably MtBE)and have been refected accordingly • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target analyte(s) K MPmcessV5 BP ARC0011911Quarterly�3 QTR WNI 1191 GWMR 3Q03 doc Page 1